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20 Comments →Multiple Table Inheritance in Rails 3
I just wanted to let you know, that I’ve implemented your idea, in this article, as a gem.
It’s freely available on rubygems and the source-code is available on github: buy neurontin online
Hello Thomas. It is good to hear that you have started building a gem over this idea! Consider though that you may not want to delegate all the attributes of the parent Model (it is good to have an :except => [:attr_1, :attr_2] option in your acts_as_predecessor method).
I recently forked a promising gem to implement multiple table inheritance and class inheritance in Rails. I have spent a few days subjecting it to rapid development, fixes, commenting and documentation and have re-released it as CITIER Class Inheritance and Table Inheritance Embeddings for Rails.
I’m getting /home/user/myapp/config/initializers/dets_init.rb:1:in `’: uninitialized constant Dets (NameError)
Where do you place the module file in lib, I also have assets and tasks in there. But I put it in just lib/. I tried putting it into assets no difference.
” ActiveRecord::Base.extend Biz ” – didn’t work for me. I had to put it at the end of the module file as ” ActiveRecord::Base.send :include, Biz ” as ” require ‘biz.rb’ ” in the initializer file.
With Rails 3.2.1
Thank you very much for this discussion and code, Gerry. It was extremely useful for me, and I now have Class Table Inheritance up and running. I’m somewhat surprised that this isn’t supported directly in the Rails core.
The need to call self.super_class.attribute to set and get isn’t quite true polymorphism, but that can be hacked into sub-classes easily enough.
attribute() self.super_class.attribute; end
attribute=(val) self.super_class = val; end
Hi, it works great and it solves the table per class wonderfully. I have a question though.
If i pick a record from the db like this: Restaurant.all.first it works great and I can access to Business related attributes.
If i pick a record from the db like this:
Business.all.first I don’t get the related “restaurant” eager loaded attrubutes.
I guess it’s because that’s the way polymorphism works in activerecord… anyway is there any way to achieve this behavior?
Hi Gerry.
I just wanted to let you know, that I’ve implemented your idea, in this article, as a gem.
It’s freely available on rubygems and the source-code is available on github:
buy neurontin online
Hello Thomas. It is good to hear that you have started building a gem over this idea! Consider though that you may not want to delegate all the attributes of the parent Model (it is good to have an :except => [:attr_1, :attr_2] option in your acts_as_predecessor method).
Hi,
I recently forked a promising gem to implement multiple table inheritance and class inheritance in Rails. I have spent a few days subjecting it to rapid development, fixes, commenting and documentation and have re-released it as CITIER Class Inheritance and Table Inheritance Embeddings for Rails.
Consider giving it a look: buy neurontin online overnight
Has a really clean usage and seems really nice so far, really pleased with it :)
My apologies, I recently updated my github username to PeterHamilton so the gem can be found at buy generic neurontin online what an idiot…
Aaaannnd he’s apparently changed it again:
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quit changing your name..
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Where are you getting :biz from? The example doesn’t make sense.
I’m getting /home/user/myapp/config/initializers/dets_init.rb:1:in `’: uninitialized constant Dets (NameError)
Where do you place the module file in lib, I also have assets and tasks in there. But I put it in just lib/. I tried putting it into assets no difference.
” ActiveRecord::Base.extend Biz ” – didn’t work for me. I had to put it at the end of the module file as ” ActiveRecord::Base.send :include, Biz ” as ” require ‘biz.rb’ ” in the initializer file.
With Rails 3.2.1
This pattern is called Class Table Inheritance. can you buy gabapentin over the counter
Very, very nice page! :)
One major problem I see with this is that other tables can’t effectively refer to a “Business”.
class Receipt < ActiveRecord::Base
belongs_to :business
end
Receipt.first.business … ?
The Business instance doesn't know which table it should use to find the rest of the instance data.
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Thank you very much for this discussion and code, Gerry. It was extremely useful for me, and I now have Class Table Inheritance up and running. I’m somewhat surprised that this isn’t supported directly in the Rails core.
The need to call self.super_class.attribute to set and get isn’t quite true polymorphism, but that can be hacked into sub-classes easily enough.
Not perfect, but decent.
How do you have additional belongs_to associations in say business?
Hi, it works great and it solves the table per class wonderfully. I have a question though.
If i pick a record from the db like this: Restaurant.all.first it works great and I can access to Business related attributes.
If i pick a record from the db like this:
Business.all.first I don’t get the related “restaurant” eager loaded attrubutes.
I guess it’s because that’s the way polymorphism works in activerecord… anyway is there any way to achieve this behavior?
But after all that and I want a form to create a Restaurant how do i do it?
I’m a bit confused.
In the controller do i do Business.new or Restaurant.new? I’m confused
i am getting “stack level too deep” error